Electric nerve pulses from the retina to brain are conveyed by
aqueous humour
pupil
optic nerves
ciliary muscles
Electric nerve signals are conveyed by optic nerves to the brain.
(a) Draw a labelled diagram of the human eye. Label the following parts on this diagram: Cornea, Iris, Pupil, Ciliary muscles, Eye-lens, Retina, Optic nerve and Blind spot.
(b) What are the functions of the following parts of the eye?
(i) Iris (ii) Eye-lens (iii) Ciliary muscles (iv) Retina (v) Optic nerve
The change in converging power of an eye-lens is caused by the action of:
(a) iris
(b) ciliary muscles
(c) optic nerve
(d) retina
What is the function of the following -
a - pupil
b- cornea
c- retina
d- iris
e - eye lids
d- optic nerve
d- siliary muscles
Human eyeball consists of three layers and it encloses
(a) lens, iris, optic nerve
(b) lens, aqueous humour and vitreous humour
(c) cornea, lens, iris
(d) cornea, lens, optic nerve